Within 90 days of receipt of notice of final action taken by 
a department, agency, or unit referred to in subsection (a) of this section, or 
by the Equal Employment Opportunity Commission upon an appeal from a decision or 
order of such department, agency, or unit on a complaint of discrimination based 
on race, color, religion, sex or national origin, brought pursuant to subsection 
(a) of this section, Executive Order 11478 or any succeeding Executive orders, 
or after one hundred and eighty days from the filing of the initial charge with 
the department, agency, or unit or with the Equal Employment Opportunity 
Commission on appeal from a decision or order of such department, agency, or 
unit until such time as final action may be taken by a department, agency, or 
unit, an employee or applicant for employment, if aggrieved by the final 
disposition of his complaint, or by the failure to take final action on his 
complaint, may file a civil action as provided in section 
2000e–5 
of this title, in which civil action the head of the department, agency, or 
unit, as appropriate, shall be the defendant.